Learn How to Sketch a Signal with Step-by-Step Instructions

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To sketch the signal u(t-3) - 2u(t-8) + u(t-5), start by plotting u(t-3) and u(t-5) as you already know how to do. The key challenge is understanding the -2u(t-8), which means you will subtract 2 from the graph starting at t=8. After plotting u(t-3) and u(t-5), you adjust the graph downwards by 2 units at t=8. This involves adding the ordinates of the individual components to create the final sketch. The discussion emphasizes the importance of sequentially adding and subtracting the components to accurately represent the signal.
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Sketch the following signal

u(t-3)-2u(t-8)+u(t-5)

if it was u(t-3)+u(t-5) I'd be able to sketch it, but the 2u(t-8) is confusing me
help me :(

I can draw the first part u(t-3) how do I add the second to the graph and then the third
 
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Take the 3, 5, and 8 terms in order. Start by drawing u(t-3). Then add u(t-5). You said you already can do that. Now just subtract 2u(t-8). You just add graphs by adding their ordinates.
 
LCKurtz said:
Take the 3, 5, and 8 terms in order. Start by drawing u(t-3). Then add u(t-5). You said you already can do that. Now just subtract 2u(t-8). You just add graphs by adding their ordinates.

Thanks a lot, but I am confused on the 2u part. I can draw u(t-3) and u(t-5) but what is 2u? I'm used to u's
 
zee3b said:
Thanks a lot, but I am confused on the 2u part. I can draw u(t-3) and u(t-5) but what is 2u? I'm used to u's

You multiply u(t) by 2, so its values are 0 and 2.
 
hey so this is my rough sketch of the first and last part how exactly will i fit in the -2u(t-8) in this. I did it in paint lol :( I'm a total noob but in the process of learning more help will be appreciated

untitlediioo.jpg
 
hey I was trying to work on it more, is it by any chance something like this

untitlediioo-1.jpg
 
Ta Daa! He gets it!
 
Thanks <3
 
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